Fluid-absorbent articles

Patent metadata

Field	Value
Publication number	US-9480968-B2
Application number	US-201414308968-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Aug 6, 2008
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

The present invention relates to a process for producing fluid-absorbent cores, comprising mixing a fibrous material and fluid-absorbent polymer particles having low moisture content and low apparent density and pressing the obtained mixture under specific conditions.

First claim

The invention claimed is:

1. A fluid-absorbent article, comprising
(A) an upper liquid-pervious layer,
(B) a lower liquid-impervious layer and
(C) a fluid-absorbent core between the layer (A) and the layer (B), comprising a fibrous material and 10 to 80% by weight fluid-absorbent polymer particles having a particle size of less than 1000 μm, a medium particle size of 200 to 600 μm, a moisture content of less than 20% by weight, a mean sphericity of at least 0.84 and a floating particle fraction (FPF) of at least 10%,
wherein the core (C) has a density of
D<β× 0.14 g/cm 3 +0.18 g/cm 3

wherein D is the density of the core (C) and β is the weight fraction of fluid-absorbent polymer particles in the core (C), wherein the fluid-absorbent polymer particles are hollow spheres.

2. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a content of hydrophobic solvents of less than 0.005% by weight.

3. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent core contains at least 9 g of the fluid-absorbent polymer particles.

4. The fluid-absorbent article according to claim 1 , wherein at least 90% by weight of the fluid-absorbent polymer particles have a diameter of from 100 to 800 μm.

5. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles comprise at least partly of polymerized acid group-bearing monomers.

6. The fluid-absorbent article according to claim 1 , wherein the fibrous material is hydrophilic.

7. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a saline flow conductivity (SFC) of at least 5×10 −7 cm 3 s/g.

8. The fluid-absorbent article according to claim 1 , wherein a top view area of the core (C) is at least 200 cm 2 .

9. The fluid-absorbent article according to claim 1 , wherein the fibrous material is a synthetic fibrous material.

10. The fluid-absorbent article according to claim 1 wherein the floating particle fraction (FPF) is at least 12%.

11. The fluid-absorbent article according to claim 1 wherein the floating particle fraction (FPF) is at least 14%.

12. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a moisture content of at least 8% and less than 20% by weight.

13. The fluid-absorbent article according to claim 12 , wherein the fluid-absorbent polymer particles have a content of hydrophobic solvents of less than 0.005% by weight.

14. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a centrifuge retention capacity (CRC) of at least 10 g/g.

15. The fluid-absorbent article according to claim 14 , wherein the fluid-absorbent polymer particles have a saline flow conductivity (SFC) of at least 5×10 −7 cm 3 s/g.

Assignees

• Basf Se

Inventors

• Weismantel Matthias
• Funk Rüdiger
• Schröder Ulrich
• Krüger Marco
• Bertha Sylvia
• Louden John Joseph

Classifications

• A61F13/15203

  Properties of the article, e.g. stiffness or absorbency (chemical aspects A61L15/00) · CPC title

• A61F2013/5307

  characterized by the quantity or ratio of superabsorbent material · CPC title

• A61F2013/530496

  being fixed to fibres · CPC title

• A61F2013/15422

  Density · CPC title

• B01J20/28028

  Particles immobilised within fibres or filaments · CPC title